Examples for

Common Core Math: Grade 2: Algebraic Thinking

In second grade, students build fluency with adding and subtracting numbers up to 20. Students perform addition and subtraction up to one hundred, including by solving for unknown values in real-world scenarios described in word problems. To build a foundation for multiplication, students practice reasoning with groups of objects, including by determining if a group has an even or odd number of objects and by counting objects arranged in rectangular arrays of rows and columns.
Common Core Standards

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CCSS.Math.Content.2.OA.A.1
second grade common core standard OA.C.4

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second grade operations and algebraic thinking common core standards
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Addition & Subtraction

Perform addition and subtraction.

Add and subtract whole numbers (CCSS.Math.Content.2.OA.A.1):

17 + 52
32 - 8
add 15 to 25
subtract 14 from 38

Solve addition and subtraction equations (CCSS.Math.Content.2.OA.A.1):

solve 49 - 22 + 6 = ?
solve ? + 14 = 48
solve 12 + ? = 29
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Foundations of Multiplication

Reason with equal groups of objects.

Determine if a number is even or odd (CCSS.Math.Content.2.OA.C.3):

is 8 even?
odd numbers less than 20

Use repeated addition to count groups of objects (CCSS.Math.Content.2.OA.C.4):

4 three times
2 + 2 + 2 + 2 + 2
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